Press guard



Dec. 26, 1922. 1,439,818. 7 A. W. HORDERN.

PRESS GUARD- HLED JUNE 5. I922- 4 SHEETS-SHEET I.

"Dec. 26, 1922.

1,439,818. A. W. HORDEBN.

PRESS GUARD- mso mum. 1922.

4 SHEETS-SHEET 3.

Dec. 26, 1922.

A. w. HDRDERN. PRESS GUARD,

SSSSSSSSSSSSS 4.

to various makes of presses.

Patented Dec. 26, 1922;.

1 than;

a e NT, or F1 ALFRED WILLIAMHGBDERN, or BIRMINGHAM, ENGLAND rnnsseunnn.

Application filed: uiie 5,

same.

This invention relates to press guards and has for its primary object to provide proved actuating means for guards of presses, stamping hammers or other similar devices.

One of the objectsoi' the present invention is to provide an actuating device so constructed that a standard design of actuating device can befappli ed withoutdifiiculty' Another object of the present inventionis to provide a press guard and actuating mechanism wherein the greatest degree. of safety is obtained by arranging that the guard moves into its operative position at the commencement of the downward move ment of the ram and ispositively held in its operative position until the ram 'has almost completed its upward movement.

Aj'further object ottlie presentinvention isto pr'ovidefla press guard which maybe constructed as a self-contained unit for application to any press andwhich can be applied thereto with aminiinum amount of addition to the p'ressitself. k I

A further object of the present invention is to provide an improved form ot press guard which will come into action more quickly than those at present generally in use. p 7 Y Referring to the drawings 'Figure 1 is a view sideelevation shewing one formot press guard and'aotuating mechanism constructed according to my invention. I

Figure 2 is an and elevation thereof.

Figure 8 a sectional plan shewing a portion of the device.

Figure i is a view in side elevation shewing another constructio oi press guard aIiCl actuating device n accordance with my invention. I I

Figure 5 showsanalternative methodof moving the press gua rd from the press. I

In the construction illustrated in Figures 1 to the framework ofthe press isrepre- 1922; Serial No. 566,158.

sentedat 1 and the moving ram is shewn at In this construction" the press guard and its actuating mechanism is made as a singie' unit which can be applied; to any press with a minimum of addition to'the press. Aswill be seen from the drawings, the only fitting to be applied to the press in this case is an operating pin 3 which'is'se-' cured to the ram. This pin 3 engages in a slot torined n a lever 5 which ispivoted at 6 to a bracket]? secured on airam'ework 8 which carries'gui'des 9 upon whichthe' press guard 10 slides,

"fie end of the lever 5 is provided with a slot 11in which engages a pin 12 carried on the end of a piston rod'13,

This piston rod 13 operates in a fluid pressure cylinder 14:, the rod 13 being connected to piston 15. From the base of the cylincylinder 14 in communication with a second fluid pressure cylinder 17 which is arranged right angles to the cylinder 14. Within the cylinder 17 is a piston 18 having a piston rod 19 which is connected atQO to the press guard 10.

.The'rear end of the cylinder 17 is pro vided with a cock or tap 21 whichean be opened to relieve the pressure therein when.

required. I

The pipe connection 16 may ii: required he a flexible connection so that if the apparatus is .to be applied to a machine whereinthe distance between the rain in its upper ;posi-.

required whilst the cylinder 14: and lever 5 may be mounted adjacent to'the rain in its upper position. 1

. t .75 der i4: isa pipe connection 16 placing the It willbe observed that the slott is a t curved slot. It isdesigned so that when the ram commences to descendthe lei ere given an immediate movement which is sutii- I cient. to pump fluid from the cylinder it to the cylinder 17 and the fluid thus pumped operates the lever 18 so as to slide thepress guard 10 along its guides 9. This movement is completed at thebeginningot the downward movement of the T511015 after which the pin 3 movesalong the lower. part of the slot 4 without causing any movement of the lever 5.

Upon the return no motion of the llever 5 takes place until movement of the ram the ram has almost reached its upper position. The lever 5 is then operated so as to relieve the fluid pressure in the cylinder 17 when the press guard 10 is withdrawn by the tension spring 22 connected to the guard at 23 and to the frame 8.

The guides 9 may be provided with coiled springs 24 which act as buffers for the press guard when it comes into operation whilst the leading'edge of the press guard may be provided with a rubber or other butter -5 toprevent the hand of the operator from being damaged it it should come into violent contact therewith.

, In using fluid pressure or vacuum for conveying the motion 'trorna lever such as 5 to the press guard 10 several advantages are obtained. For instance, if a flexible pipe connection is used between the cylinders 14 and l? the relative positions these cylinders maybe varied to suit different sizes and makesof machines without rendering i any modification in the design of the apparatus necessary. Further, the stroke or amount of movement of the press guard can be regulatedas may be desired by providing a hole in the cylinder 1'? which will form an exhaust port to be uncovered by the piston 18 when the required length of movement is obtained. Similarly by providing a hole in the cylinder 14, i't required any part of the movement of the lever 5 may become lost motion, i. e. the lever 5 may move but the fluid under the piston 15 will escape through the hole if provided. After the hole has been passed by the piston 15 however, movenientof the press guard will begin to take place. I

In the construction shewn in Figure 4 the arrangement 1s similar to that described with reference to Figures 1, 2 and 3 except that in place of the press guard 10 I pro -vide a press guard of lattice work or lazy tongs structure shown at26. In this case the piston rod 19 is connected at 27 to the end links 34 of the lattice work guard. These links 34 are pivotally connected to lugs 35 associated with bosses 86 which can slide on a transverse'guide' rod 37 connected to the frame.

Atthe other end of the lazy tongs guard the ends links 38 are pivoted to lugs 39 associated with sliding bosses4 0 upon a transverse guide rod 41. The guide rod 41 at its extremities is connected to bosses 42 upwardly or a spring may be provided to assist in the return movement.

press With this arrangement any movement given to the links 34 is magnified at the other end of the lazy tongs so that the leading edge o1 the guard will move much faster than the piston rod 19. The leading edge of the lazy tongs guard may be provided with a .bufl'er 45 if required.

In the "construction shewn in Figure 5 instead of driving the piston of the primary fluid pressure cylinder by means of a lever, the piston rod 46 is connected direct at 47 to a crank upon the driving shaft 48 of the press. When this construction is used it will be necessary for the primary fluid pressure49to be mounted for oscillation and it is accordingly pivoted at 50 to a fixture.

in the construction shewn in Figure 6 instead 01 employing rigid pipe connection l6 betvveen the primary fluid pressure and the fluid pressure cylinder associated with the guard a flexible pipe connection 51 is used so that the relative positions of the two fluid pressure cylinders can be arranged as may be most suitable for the machine to which the apparatus is applied.

' In connection with Figure 6 it will be understood that the construction of the guard and the fluid pressure associated therewith may either be similar to that shevvn in Figure 1 or that shewn in Fig ure 4.

l/Vhat I claim then is l. A guard for presses comprising a movableguard, an operating lever adapt'ed to be moved by a projection on the ram of the press, a fluid pressure cylinder associated with said lever, a piston in said cylinder, a rod connecting said piston with said lever, a fluid pressure cylinder associated with said guard, a piston in said cylinder, a rod connecting said piston to said guard, and a pipe connection from one fluid pressure pressure cylinder associated with'said lever, a piston in sa1d'cyl1nder, a rod connecting said piston with said lever, a fluid pressure cylinder associated with said guard, a piston insaid cylinder, a rod connecting said piston to said guard, and a pipe'connection from one fluid pressure cylinder-to the other, whereby motion of the operating lever is accompanied by motion of the guard.

3. A guard for presses comprising a movable guard, an operating lever having a two armed slot for engagement by a projection on'the ram of the press, a fluid pressure cylinder associated with said lever, a piston ill) in said cylinder, a rod connecting said piston with said lever, a fluid pressure cylinder associated with said guard, a piston in said cylinder, a rod connecting said piston to said guard, and a pipe connection from one fluid pressure cylinder to the other, whereby motion of the operating lever is accompanied by motion of the guard.

4. A guard for presses comprising a morable guard, a fluid pressure cylinder, at piston in said cylinder, a rod connected to said piston and adapted to be connected to a moving part oi the press, a fluid pressure cylinder associated with said guard, a piston in said cylinder, a rod connecting said piston to said guard, and a pipe connection from one fluid pressure cylinder to the other, whereby motion of the press is accompanied by motion of the guard.

5. A guard for presses comprising a guard mounted so that it can reciprocate, guides for said guard, a frame carrying said guides, a fluid pressure cylinder, a piston in said cylinder, a rod connected to said piston and adapted to be connected to a moving part of the press, a fluid pressure cyiinder associated with said guard, a piston in said cylinder, a rod connecting said piston to said guard, and a pipe connection from one fluid pressure cylinder to the other, whereby motion of the press is accompanied by motion of the guard.

6. A guard for presses comprising a lazy tongs structure forming a reciprocating guard, guides for said guard, a frame carrying said guides, a fluid pressure cylinder, a piston in said cylinder, a rod connected to said piston and adapted to be connected to a moving part of the press, a fluid pressure cylinder associated with said guard, a piston in said cylinder, a r od connecting said piston to said guard, and a pipe connection from" one fluid pressure cylinder to the other, whereby motion of the press is accompanied by motion of the guard.

'7. A guard for presses comprising a lazy tongs structure forming a reciprocating guard, means for holding the rear end of said guard against longitudinal movement, guides for said guard, a frame carrying said guides, a fluid pressure cylinder, a piston in said cylinder, a rod connected to said piston and adapted to be connected to a moving part of the press, a fluid pressure cylinder associated with said guard, a piston in said cylinder, a rod connecting said piston to a point on the guard in advance of its rear end, and a pipe connection from one fluid pressure cylinder to the other, whereby motion of the press is accompanied by motion of the guard.

In witness whereof I affix my signature.

ALFRED WILLIAM HORDERN. 

